"therethrough" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "there",
        "3": "through"
      },
      "expansion": "there + through",
      "name": "compound"
    }
  ],
  "etymology_text": "there + through",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "therethrough (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1984, D A Jones, Transdermal and related drug delivery systems",
          "text": "When the system is in the form of a matrix with drug distributed therethrough, particles of the drug can be mixed with the ethylene-vinyl acetate copolymer […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Through that."
      ],
      "id": "en-therethrough-en-adv-VS6w7Lyb",
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "therethrough"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "there",
        "3": "through"
      },
      "expansion": "there + through",
      "name": "compound"
    }
  ],
  "etymology_text": "there + through",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "therethrough (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "English adverbs",
        "English compound terms",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English pronominal adverbs",
        "English terms with quotations",
        "English uncomparable adverbs"
      ],
      "examples": [
        {
          "ref": "1984, D A Jones, Transdermal and related drug delivery systems",
          "text": "When the system is in the form of a matrix with drug distributed therethrough, particles of the drug can be mixed with the ethylene-vinyl acetate copolymer […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Through that."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "therethrough"
}